Blurry reflections are extremely easy to achieve with PIDI 2D Reflections 3. All included shaders can already blur their reflections using a very fast algorithm that works on most platforms (except some older Shader Model 2.0 devices and some WebGL versions) by using a smoothness value, simulating a PBR-like behavior. In the built-in pipeline there are helpful functions to get reflections included in our 2DReflectionsUtilities.cginc file, and all of them can apply blur automatically.
In URP we have included useful nodes for ShaderGrap that also allow you to have blurry reflections with very little setup required. You can reference the included shaders in order to create your own using these nodes.
